:<br> Fully metal construction and anodizing aluminum process, durable for long for time use.<br> Use this extension tube for getting the correct for image scale or the exact spacing required for reducers or field flatteners.<br> The extension tube has a T2 interior thread and a T2 exterior thread for solving spacing problems in astrophotography and eliminates a range of focusing problems.<br> Type: Astronomical T2 thread Extension Tube<br> Male thread: M42*0.75mm<br> Female thread: M42*0.75mm<br> Link or extend tube length of the M42*0.75 Products<br> Color: Black<br> Length: 5mm 10mm 15mm 20mm<br> Color: Black<br> Please Note: This Combi are M42 (42mm) thread caliber, not M48 thread caliber<br> Due to different production batches, the two paint color on the surface(Matte black; shiny black) are shipped randomly.<br> <br> Note:<br> Please allow 0-2mm error due to manual measurement. pls make sure you do not mind before you bid.<br> Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!<br> If you really care about these details, pls DO NOT order.<br> <br> Package Include:<br> 1 x Extension Tube Kits(Size can be selected)<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store